[FL-1721] Bluetooth refactoring (#747)

* ble-glue: add on connect \ disconnect, on send \ received callbacks
* bt: rework service with furi-hal-bt and callbacks
* bt: update battery level on connect
* ble-glue: set one callback with parameters
* bt: rework callbacks, remove unused API
* ble-glue: remove dead code
* furi-hal-bt: add documentation
* ble-glue: apply changes for f7 target
* bt: rename RpcInstance -> Rpc
* ble: add disconnection reason
* ble: don't open bt record from GAP
* bt: fix RPC session close
* Assets: separate targets for icons and protobuf

Co-authored-by: あく <alleteam@gmail.com>

firmware/targets/furi-hal-include/furi-hal-bt.h

@@ -7,6 +7,10 @@
 
 #include <m-string.h>
 #include <stdbool.h>
+#include <gap.h>
+#include <serial_service.h>
+
+#define FURI_HAL_BT_PACKET_SIZE_MAX SERIAL_SVC_DATA_LEN_MAX
 
 #ifdef __cplusplus
 extern "C" {
@@ -17,10 +21,10 @@ extern "C" {
 void furi_hal_bt_init();
 
 /** Start BLE app
- *
- * @return     true if app inited
- */
-bool furi_hal_bt_init_app();
+ * @param event_cb - BleEventCallback instance
+ * @param context - pointer to context
+*/
+bool furi_hal_bt_init_app(BleEventCallback event_cb, void* context);
 
 /** Start advertising
  */
@@ -48,10 +52,20 @@ void furi_hal_bt_dump_state(string_t buffer);
  */
 bool furi_hal_bt_is_alive();
 
-/** Wait for Core2 startup
- *
- * @return     true if success, otherwise timeouted
+/** Set data event callbacks
+ * @param on_received_cb - SerialSvcDataReceivedCallback instance
+ * @param on_sent_cb - SerialSvcDataSentCallback instance
+ * @param context - pointer to context
  */
+void furi_hal_bt_set_data_event_callbacks(SerialSvcDataReceivedCallback on_received_cb, SerialSvcDataSentCallback on_sent_cb, void* context);
+
+/** Send data through BLE
+ * @param data - data buffer
+ * @param size - data buffer size
+ */
+bool furi_hal_bt_tx(uint8_t* data, uint16_t size);
+
+/** Wait for Core2 startup */
 bool furi_hal_bt_wait_startup();
 
 /** Lock shared access to flash controller